A permutation is the choice of r things from a set of n things without replacement and where the order matters
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See screenshots: Jan 19, 2020 · Sum of combinations formula
List or generate all possible combinations from multiple lists with a powerful feature
It is obtained from the previous formula by multiplying denominator and numerator by (n − k)!, so it is certainly computationally less efficient than that formula
There are two types of combinations, one where repetition is allowed, and one where repetition isnt allowed
The formula for combination helps to find the number of possible combinations that can be obtained by taking a subset of items from a larger set
to access the probability menu where you will find the permutations and combinations commands
So the formula for calculating the number of combinations is the number of permutations/k!